The Big Bang I
During the Big Bang, the universe began to do this very quickly... and is still doing it today.
What is expand
What force eventually pulled matter together to form stars and galaxies?
What is Gravity
All stars begin their life in this cloud of gas and dust.
What is a nebula?
What stage forms after gravity pulls gas and dust in a nebula tightly together?
What is a protostar
This term describes the stretching of light toward longer, red wavelengths, showing that galaxies are moving away from us.
What is Redshift
As the universe expanded, what happened to its temperature?
What is It decreased (cooled down)
The Sun is currently in this stage of its life cycle.
What is the main sequence?
What element do stars fuse together during most of their life in the main sequence phase?
What is Hydrogen
This “afterglow” of the Big Bang appears as tiny temperature differences and was mapped by the WMAP satellite.
What is Cosmic Microwave Background Radiation (CMBR)
Fill in the blank: Scientists think the universe once existed as a tiny, hot dense ______.
What is 'point' or 'dot'
What gas is produced during nuclear fusion in a star?
What is Helium
What stage does a medium-sized star (like our Sun) enter after it runs low on hydrogen?
What is a Red giant
The warmer and colder spots in the CMBR image represent early differences in this property that later formed galaxies.
What is Density of matter
What tool do scientists use to measure the redshift of galaxies?
What is A spectroscope (or spectroscopy)
A dying low- or medium-mass star forms this structure before becoming a white dwarf.
What is a planetary nebula?
What is the very small, hot, leftover core of a low mass star called?
What is a White dwarf
What formed first after the Big Bang: atoms or subatomic particles?
What is Subatomic particles
This law says that the farther away a galaxy is, the faster it is moving away from us.
What is Hubble's Law
A high-mass star may collapse into one of these after a supernova.
What is a black hole or neutron star?
Why will our Sun never become a black hole?
It is a low-mass star (not enough mass)